Engine drive welder and methods and systems of controlling the same

ABSTRACT

Embodiments of the present invention are engine drive welding and/or cutting systems which optimize the utilization of engine drive systems, including hybrid engine drive systems. Embodiments include modular systems which allow for the remote utilization of a battery powered module which can be separated from an engine drive generator power supply. Other embodiments include engine drive power supplies that can communicate with a load coupled to the power supply, such as welders, cutters and wire feeders to determine an optimum operational level. Further embodiments include engine drive power supplies that can be coupled together to optimize fuel and system usage.

TECHNICAL FIELD

Devices, systems, and methods consistent with embodiments of the presentinvention relate to hybrid engine drive welders, and more specificallyto engine drive welders and power systems having increased versatilityand control options.

BACKGROUND

The construction and use of engine driven welders is well known. Suchwelders are often used when utility power grids are either not availableor not reliable. In such welders, an engine and generator combinationare used to generate power which is used by an output circuit togenerate an output power. In an effort to improve on these systems,hybrid engine drive welders have been developed where the welderincludes an energy storage device, such as a battery. The battery can beused by the welding system to add to the output power of the systemand/or smooth the power provided by the generator to the outputcircuit—among other uses. Such systems are known and often referred toas hybrid engine drive welders. While advancements have been made forsuch welding systems to improve their utilization and performance, thesesystems still have disadvantages in that they are large and theirversatility is somewhat limited in certain applications. Thus,improvements are needed to increase the versatility of hybrid enginedrive welding systems.

Further limitations and disadvantages of conventional, traditional, andproposed approaches will become apparent to one of skill in the art,through comparison of such approaches with embodiments of the presentinvention as set forth in the remainder of the present application withreference to the drawings.

BRIEF SUMMARY OF THE INVENTION

A first exemplary embodiment of the present invention is A welding orcutting power supply having a first module with an internal combustionengine and a generator coupled to the internal combustion engine, wherethe generator generates electrical power, and a second module which isphysically connectable to and detachable from the first module. Thesecond module has an energy storage device which receives the electricalpower when the second module is coupled to the first module and uses thegenerated electrical power to charge the energy storage device, and theenergy storage device generates an output power. The second module alsohas a power conversion circuit which is coupled to the energy storagedevice and which generates a welding or cutting output signal to beoutput from the second module. When the second module is physicallycoupled to the first module the power conversion circuit uses at leastone of the output power and the generated electrical power to generatethe welding or cutting output signal, and when the second module isphysically removed from the first module the power conversion circuituses only the output power from the energy storage device to generatethe welding or cutting signal. When the second module is physicallycoupled to the first module the power conversion circuit has a firstpeak output power and when the second module is physically removed fromthe first module the power conversion circuit has a second peak outputpower which is less than the first peak output power.

In a second exemplary embodiment of the present invention, a welding orcutting system has a power generation system which has an internalcombustion engine coupled to a generator for generating a power signal,a power conversion circuit which receives the power signal and generatesa synchronous output signal, an outlet circuit having at least oneoutlet which is coupled to the power conversion circuit and receives thesynchronous output signal, a first controller which controls anoperation of at least the internal combustion engine, and a firstcommunication module which is coupled to the controller. The system alsohas a welding or cutting power supply coupled to the at least one outletto receive the synchronous output signal and utilize the synchronousoutput signal to generate a welding or cutting output signal. Thewelding or cutting power supply has a second controller to control anoperation of the welding or cutting power supply, and a secondcommunication module coupled to the second controller which is incommunication with the first communication module. The second controllerdetermines an anticipated power demand for a given welding or cuttingoperation and generates and sends an anticipated power demand signal tothe first communication module, and the first controller uses theanticipated power demand signal to control an RPM speed of the internalcombustion engine to adjust a power level of the synchronous outputsignal.

A third exemplary embodiment is directed to a welding system which has afirst welding power generator with a first internal combustion engine, afirst generator coupled to the first internal combustion engine whichproduces a first power output signal, a first energy storage devicecoupled to the first generator to receive the first power output signalto charge the first energy storage device, a first power conversioncircuit coupled to the first energy storage device to receive a firstenergy storage device power signal and convert the first energy storagedevice power signal to a first welding output power signal which isoutput by the first welding power supply, and a first controller whichcontrols an operation of the first welding power generator. The systemalso includes at least a second welding power generator having a secondinternal combustion engine, a second generator coupled to the secondinternal combustion engine which produces a second power output signal,a second energy storage device coupled to the second generator toreceive the second power output signal to charge the second energystorage device, a second power conversion circuit coupled to the secondenergy storage device to receive second energy storage device powersignal and convert the second energy storage device power signal to asecond welding output power signal which is output by the second weldingpower supply; and a second controller which controls an operation of thesecond welding power generator. The first energy storage device iscoupled to the second energy storage device such that the second energystorage device can be charged by the first energy storage device whenthe second internal combustion engine is not operating, and the firstand second controllers are in communication with each other to controlthe charging of the second energy storage device.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and/or other aspects of the invention will be more apparent bydescribing in detail exemplary embodiments of the invention withreference to the accompanying drawings, in which:

FIG. 1 is a diagrammatical representation of an exemplary hybrid enginedrive welder;

FIG. 2 is a diagrammatical representation of an electrical system of anexemplary hybrid engine drive welder;

FIGS. 3A and 3B are diagrammatical representations of a first exemplaryembodiment of the present invention where the embodiment has adetachable power module;

FIG. 30 is a diagrammatical representation of a further exemplaryembodiment of the present invention shown in FIGS. 3A and B;

FIG. 3D is a diagrammatical representation of an additional exemplaryembodiment of the system shown in FIGS. 3A and B;

FIG. 4 is a diagrammatical representation of a second exemplaryembodiment of the present invention where the embodiment is capable ofcommunicating with coupled welding components; and

FIG. 5 is a diagrammatical representation of a third exemplaryembodiment of the present invention where the embodiment can be coupledto an additional welder for purposes of charging, etc.

DETAILED DESCRIPTION

Reference will now be made in detail to various and alternativeexemplary embodiments and to the accompanying drawings, with likenumerals representing substantially identical structural elements. Eachexample is provided by way of explanation, and not as a limitation. Infact, it will be apparent to those skilled in the art that modificationsand variations can be made without departing from the scope or spirit ofthe disclosure and claims. For instance, features illustrated ordescribed as part of one embodiment may be used on another embodiment toyield a still further embodiment. Thus, it is intended that the presentdisclosure includes modifications and variations as come within thescope of the appended claims and their equivalents.

The present disclosure is generally directed to hybrid engine drivewelders using a gas or diesel powered engine to power a generator, whichgenerates power for a welding operation. Further, exemplary welders canalso generate auxiliary power which can be used to power accessoriesconnected to the welder. Further, exemplary embodiments can use thegenerator power to provide energy to an energy storage device (e.g., abattery) which can store energy and provide that energy to the outputpower of the welder as needed. However, exemplary embodiments of thepresent invention are not limited to power supplies which provide awelding power but can also be used to provide a cutting power or anyother power as desired.

Turning now to FIG. 1, an exemplary embodiment of an engine drivenwelder is shown. Of course, the embodiment shown is intended to bemerely exemplary and not limiting in any way. As shown, the welder 100has a housing 110 which encloses the internal components of the welder100. The welder 100 has a front face 101, on which user input controls103 are located. The input controls 103 are used to input variousoperation parameters, monitor system functions, and control theoperation of the system 100. Also included on the welder 100 are outputoutlets 120. The outlets 120 can include connections for welding/cuttingcables, auxiliary power outlets providing either 110 VAC or 220 VACpower, or any other type of output power they may be desired to becoupled to the system 100. The general construction, operation andfunction of hybrid engine drive welders is known and need not bedescribed in detail herein.

Turning now to FIG. 2, an exemplary embodiment of an engine drivewelding system 200′ having an engine-hybrid design. It should be notedthat the configuration shown in FIG. 2 represents an exemplary system200 to show and describe an overall construction and operation of anengine drive-hybrid system. The overall functionality and structure ofthe system shown in FIG. 2 can be used with embodiments described hereinwith respect to FIG. 3A through FIG. 5, which the variations anddifferences described with respect to each of those Figures.

As shown in FIG. 2, engine 200 drives the electric generator 210 via adrive shaft 202. The electric generator generates an AC current which isrectified by the rectifier charging regulator 220. As illustrated inFIG. 2, electric generator 210 also can supply power to an auxiliarypower output 260 for AC current. In addition, the AC current fromgenerator 210 can be rectified and be partially directed to an auxiliaryDC power output, not shown. The DC current from rectified chargerregulator 220 is directed into battery system 230 to charge the batterywhen a feedback signal 232 indicates that the battery needs to be and/oris available for charging. The DC current supplied from the battery ofbattery system 230 is directed into a chopper module welding output 240which is used to form the desired current waveform during an arc weldingprocess. The D.C. current from the rectified charge regular 220 can alsobe directly fed in the chopper module welding output 240. As such theD.C. current from the rectified charge regular 220 can be used to onlycharge battery system 230 or be used to both charge battery system 230and supply current to chopper module welding output 240.

An engine control system 270 is provided to control the operation ofengine 200. The engine control system receives a signal via line 272from the battery system, which signal is representative of the charge onthe battery system. When the battery system is fully charged, the enginecontrol system slows or turns off engine 200. When the battery system isless than fully charged and/or below a predefined charge level, theengine control system causes the engine to increase in speed and/or beturned on.

Weld control 250 controls the chopper welding output via signal 252based upon output current information received via line 254. FIG. 2 alsoillustrates that weld control 250 can additionally receive voltageinformation from the DC current being directed from battery system 230to chopper module welding output 240. The DC current from the chopperwelding output is directed into a DC filter choke 260 to smooth out theDC current used for forming the welding arc.

An open circuit detector 280 is provided to determine whether an arc isbeing formed or is about to be formed between the electrode andworkpiece during a welding operation. When open circuit detector 280does not detect an arc, the open circuit detector causes the choppermodule 240 to turn off, thereby reducing a drain of power from thebattery system. In one non-limiting design, the voltage level betweenthe workpiece and electrode is monitored to determine the current stateof the arc.

As illustrated in FIG. 2, all the current directed to the weld output issupplied by battery system 230. In order for the battery system 230 tosupply the total current to the weld output 290, the size of the batterysystem is selected to have an adequate amp-hour size which can supplythe maximum power rating of the welder for a sufficient period of time.Typically, the duty cycle for most manual stick welding is about 20-40%.As a result, during a period of about 10 minutes, an electric arc isgenerated for only two to four minutes. The size and amp rating of thebattery system 230 must be sufficient to at least supply a full amountof power to the electric arc during this duty cycle in order to obtain aproper electric arc during an arc welding process. During the time thatan electric arc is not generated, the rectifier charging regulator 220directs DC current into battery system 230 to recharge the depletedbattery system. It is desirable to select a battery which can rapidlyrecharge so that during the intermittent periods of time wherein anelectric arc is not being generated, the battery can be rapidlyrecharged so that it will be able to generate an electric arc during asubsequent duty cycle. Typically, the amp-hour size of the battery isselected so as to provide the arc welding requirements for the maximumwelding output rating of the welder for at least about one minute, andtypically about 5-45 minutes.

As can be appreciated from the design and operation of the hybrid energysource for welder A, the size of engine 200 and electric generator 210need not be sized to provide the maximum welding output rating of thewelder. The size of engine 200 and electric generator 210 only needs tobe sufficiently sized to provide enough current to the battery ofbattery system 230 to adequately recharge the battery after the batteryhas been partially discharged when forming an electric arc. Forinstance, if the maximum welding output rating of a welder is 10 kW ofpower, and the maximum average duty cycle for a welding operation is40%, the engine and electric generator only needs to produce sufficientcurrent to supply 40% of the maximum welding output rating since onlythis much current is being discharged by the battery system during aparticular duty cycle for the welder. As a result, the size of theengine and the size of the electric generator can be significantlydecreased by using the hybrid energy source of the present invention. Inaddition to the cost savings associated with using a smaller engine andelectric generator, the efficiency rating for the use of the currentgenerated by the electric generator is significantly increased sincemost of the current is used to recharge the battery after it has beenpartially discharged during the formation of an electric arc. In thepast, only 20-40% of the current generated by the electric generator wasused in welding operations when the duty cycle was about 20-40%. Inaddition to the increase in energy usage efficiency, the size of themotor needed to provide sufficient power to meet the maximum weldingoutput rating of the welder is decreased since a smaller engine isneeded to power the hybrid energy source. Another benefit of the hybridenergy source is the ability of the welder to generate a welding currentwithout having to operate engine 200 and electric generator 210. Whenbattery system 230 is fully charged, the battery system has an adequateamp-hour size to provide the welding arc requirements during aparticular period of time. As a result, the welder can be used inlocations where the running of an engine powered welder is unacceptabledue to noise and/or engine exhaust issues.

Turning now to FIGS. 3A and 3B an exemplary embodiment of the presentinvention is shown. Traditional hybrid-engine drive welding powersupplies are large, bulky systems because of their need to house anengine, generator, gas tank and all other components needed to providethe desired operational functions. As such, these systems are large,heavy and difficult to move to remote locations. However, in certaincircumstances power is desired in locations where a traditional systemis too big to be moved to, or otherwise too difficult to get to thedesired location, and the use of long power cables is not desirable. Theembodiment shown in FIGS. 3A and 3B addresses these issues by providinga modular hybrid-engine drive welding system 300.

The system 300 is comprised of two modular sections 300′ and 300″, eachof which can be fully enclosed in a housing 310 (like the one shown inFIG. 1). However, in this exemplary embodiment, a power module 300″ canbe removed from the housing 310 and taken to another remote location andbe used to provide an output power even though the module 300″ isseparated from the engine and generator—which are in the primary module300′. This will be described more fully below.

As shown in FIG. 3A each of the primary module 300′ and the removablepower module 300″ are positioned within a housing 310. In thisconfiguration, the system 300 can operate very similar to the systemdescribed above in FIG. 2. In the embodiment shown, the primary module300′ contains the engine 321, the generator 323 and a system controller325. The controller 325 controls and monitors the operation of thesystem 300 and its components as in traditional engine drive systems(see, e.g., controller 270). The controller 325 can also be coupled to auser interface 327 which is positioned on the housing 310 or on a faceof the housing where a user can input information as needed. When thetwo modules are secured together this user interface 327 can be theprimary user interface for the system 300 and be used to control theentire operation, as needed. The engine 321 and generator 323 cangenerate power as described herein, or like other known engine drivesystems. The controller 325 is also coupled to a wireless (or wired)communication device 329, such as a receiver/transmitter circuit, whichis capable of communicating with other systems and components. Forexample, the communication device 329 is capable of communicating with acommunication device 339 in the removable power module 300″, asdescribed below. Although not shown, the primary module 300′ can alsocontain circuitry like the rectifier 220 shown in FIG. 2, and othercircuits and systems which are needed to convert power from thegenerator 323 to power which can be used by the system 300. In someexemplary embodiments, when the module 300″ is physically coupled to themodule 300′ the controller 325 can control the entire operation of thesystem 300, while in other embodiments, the controllers 325 and 333 canwork together.

Removably coupled to the primary module 300′ is a removable power module300″. The removable power module 310″ contains at least an energystorage device 331 (similar to 230), another controller 333 (see, e.g.,item 250 in FIG. 2) and an output power converter 335. The output powerconverter 335 can be any circuit or system that is capable of generatingthe desired output power from the generator and/or the energy storage331. The output power converter 335 can generate both welding powerwhich is either synchronous or asynchronous, and can also generatesynchronous output power which can be sent to outlets (e.g., 110 or 220VAC) which can be used by auxiliary devices, such as tools, etc. Thecontroller 333 controls the operation of the components within theremovable power module 300″ similar to the controller 250 in Figure, orother known engine drive devices. Further, when the removable powermodule 300″ is coupled to the primary module 300′ the controller 333 canwork with the controller 325 to control the operation of the entiresystem 300 (or the controller 325 can be the only used controller insome embodiments). The controller 333 is also coupled to a communicationdevice 339, which can communicate either wirelessly or via wiredcommunication (or both). In alternative embodiments, the controllers cancommunicate via a wired connection (e.g., through connection 343) whenthey are physically coupled, and then switch to wireless communicationwhen separated. In the configuration shown in FIG. 3A the two modules300′ and 300″ are secured to each other via releasable mechanicalconnections 341 and 342. These mechanical connections 341/342 can be anytype of mechanical connection (e.g., latch, fasteners, etc.) which arecan hold the two modules 300′ and 300″ in a physically secure, buteasily removable relationship. However, the fasteners are alsoreleasable such that the power module 300″ can be physically releasedfrom the primary module 300′. Further, each of the modules will haveelectrical couplings so that an electrical connection 343/344 can bemade to electrically couple to the two modules together. Thus, whensecured together the two modules 300′ and 300″ can operate similar toknown hybrid-engine drive welders. The power module 300″ also has poweroutlets 351 and 353 so that the generated power can be provided tooutside loads. For example, the outlets 351 can be coupled to weldingcables so that a welding operation can be performed, and the outlets 353can be auxiliary power outlets to which accessories, etc. can becoupled. However, unlike known systems, the power module 300″ isremovable and can be used remotely from the primary module as describedbelow. When the two modules 300′ and 300″ are coupled to each other asshown in FIG. 3A the power output of the system 300 can be consistentwith known engine drive power supplies, and can have an average peakcurrent output as high 400 amps. Of course, other embodiments can have ahigher, or lower peak output as needed.

FIG. 3B shows the two modules 300′ and 300″ separated from each other.Unlike known systems, the removable power module 300″ can be removedfrom the primary module 300′ and taken to an even more remote locationto provide power. In such situations, the energy storage device 331provide the necessary energy for the output power converter 335 toprovide the desired output power. In some exemplary embodiments, whenremoved from the primary module 300′ the battery 331 provides power tobe used for a welding output through the outlets 351. In other exemplaryembodiments, the battery 331 provides energy to the output powerconverter 353 which generates output power to be used by the auxiliaryoutlets 353 to power accessories, etc. This power can be eithersynchronous or asynchronous, as the demand requires. For example,exemplary embodiments can be configured such that the power module 300″is only capable of providing synchronous auxiliary power to theauxiliary outlets 353 because the energy storage device 331 (battery)cannot provide sufficient energy for a welding operation. Thus, unlikeknown engine drive welders, embodiments of the present invention have aremovable power module 300″ that can be removed from the primary module300′ and taken to an even more remote location to provide a temporarywelding/auxiliary power source for a given requirement, whereas when thetwo modules are coupled they operate like a single hybrid-engine drivewelder/power supply. Such flexibility is not achievable with knownsystems. Thus, in some embodiments, the module 300″ can have an outputcapability which is less than that of when the module 300″ is coupled tothe module 300′. For example, in some exemplary embodiments the maximumaverage output current for the module 300″—when it is separated—can be100 amps. However, when the module 300″ is connected to the module 300′the maximum average current that can be supplied by the module 300″ canbe as high as 400 amps. In some exemplary embodiments, the ratio ofaverage peak current that can be supplied by the module 300″ from itsconnected state to its non-connected state can be in the range of 2 to 1to 5 to 1. For example, in an exemplary embodiment, when connected themodule 300″ can provided a peak average current of 400 amps, but whendisconnected the same module can only provide a peak average current of100 amps—a ratio of 4 to 1.

Further, as shown in FIG. 3A, the power module 300″ has its own separateuser interface 337 which allows a user to operate the functionality ofthe power module 300″ separately from the primary module 300′.Specifically, when the power module 300″ is separated from the primarymodule 300′ a user can interact with the power module via the userinterface 337 and control the operation of the module 300″ without theneed of the primary user interface 327. In some exemplary embodiments,the user interface 337 is not accessible when the power muddle 300″ isinserted into the housing 310 and coupled with the primary module 300′.However, in other exemplary embodiments, the user interface 337 can bepositioned such that a user can interact with the user interface 337, orat least view the interface 337 when the power module 300″ is insertedinto the housing 310. For example, the user interface 337 can displaythe charge state, etc. of the energy storage device 331 to allow a userto understand the charge status, etc.

Further, the power module 300″ also has a communication device 339 whichis similar to the device 329 in the primary module 300′. Thecommunication module 339 allows the power module 300″ to communicate,either wirelessly or via a wired connection, with the primary module300′ and any other appropriate device. For example, a remote controldevice or pendant (not shown) can be used to communicate with theprimary and power modules. The pendant/remote controller can be used tomonitor the operation, function of the modules and/or control theiroperation.

Because the power module 300″ is removable the internal structure of thesystem 300 can have a track or rail structure (not shown) that allowsthe power module 300″ to be easily removed and reinserted as needed. Thetrack/rail system also allows the power module 300″ to be engaged withthe primary module consistently so that the connections 341 and 342 canbe consistently made.

FIG. 3B depicts the system 300 shown in FIG. 3A with the power module300″ separated from the primary module 300′. As discussed above, thepower module 300″ is removable from the system 300 and can operateseparate from the primary module 300′. Specifically, in some exemplaryembodiments, the power module 300″ can provide a welding/cutting powerfrom the energy storage device 331 and/or can provide synchronousauxiliary power, as discussed above. The module 300″ can be taken to anydesired remote location to provide the power needed. When the remoteusage of the module 300″ is completed and/or the battery 331 isdepleted, the module 300″ can be returned to the primary module 300′ andthe energy storage device 331 can be recharged.

In some exemplary embodiments, the power module 300″ communicates (viathe device 339) with the primary module 300′ while they are separatedfrom each other. In such embodiments, the status of the power module300″ can be monitored on the user interface 327. Further, the userinterface 327 can be used to control the operation of the power module300″ via the communication devices 329 and 339. In exemplaryembodiments, the controller 325 monitors the usage of the module 300″via the communication devices and when the energy storage device 331gets below a threshold charge level the controller 325 starts the engine321 to and prepares the module 300′ to charge the device 331 upon returnthe of module 300″. For example, either (or both) of the controllers325/333 can determined a remaining usage time or a charge level of thestorage device 331 (e.g., below 10% charge, or less than 10 minutes ofusage time remaining), and based on that determination cause the engineto be started automatically in anticipation of the returning module300″. This will save time by having the primary module 300′ prepare fora charging operation prior to the physical connection of the twomodules. Similarly, in other exemplary embodiments, a user can use theuser interface 339 on the power module 300″ to turn on the engine 321via the communication devices 329/339 and thus have the primary module300′ warmed up and ready for charging prior to engagement of the twomodules. For example, during use of the power module 300″ a user noticesthat the energy charge level of the storage device 331 is below adesired level. The user can then use the interface 337 to start theengine 321 of the primary module 300′ so that the recharging of thedevice 331 can begin as soon as the module 300″ is recoupled with themodule 300′.

In other exemplary embodiments, the communication devices 329 and/or 339have mobile communication and GPS location capabilities, so that theirrespective locations can be determined relative to each other. This willallow a user of the primary module 300′ to easily locate the powermodule 300″ that is associated with the system 300. The implementationof mobile GPS positioning technology is generally known and need not bediscussed in detail herein. In other exemplary embodiments, the GPSpositioning information can be used to disable the functionality of thepower module 300″ if the power module 300′ is moved to a location whichis outside of a desired range. For example, it may be desirable to keepthe power module 300″ within 200 yards of the primary module 300′, andwhen either or both of the controllers determined that this distance hasbeen exceeded the function of the power module 300″ can be disabled.This can aid in preventing theft, or otherwise moving the power moduleto an undesired location.

In some exemplary embodiments, a cable connection 360 can be providedbetween the primary module 300′ and the power module 300″ to allow forremote charging of the battery 331. In such embodiments, a cable 360 canbe coupled at the connections 344 to provide the charging energy to thebattery 331. Additionally, in such embodiments, the cable 360 can allowfor the full welding operation of the system 300 (for example, using thegenerator power to provide the welding power) while the module 300″ ispositioned remotely from the module 300′.

FIG. 3C is a further exemplary embodiment of the primary module 300′,where the module 300′ has an auxiliary power circuit 370 and at leastone outlet 371. That is, in some applications, it may be desirable tocontinue to provide auxiliary power (for tools, lights, etc.) at thelocation of the primary module 300′ even after the power module 300″ isremoved. In this embodiment, the generator and engine can still be usedto provide power to the auxiliary power circuit 370, which delivers thepower to the outlets 371. Thus, any tools or accessories can still beused even though the power module 300″ is located at a remote locationand being used for another purpose.

FIG. 3D depicts a further exemplary embodiment of the present invention,where a power conditioning and charging circuit 380 is positioned withinthe module 300′. This circuit receives the power from the generator 323and conditions the power to be used by the energy storage device 331and/or the output converter 335. This circuit 380 converts the powerfrom the generator so that it is usable by the energy storage deviceand/or the output converter. When the module 300″ is coupled to themodule 300′, through the connections 344 and 381, the circuit 380 cancharge the energy storage device 331 or provide power to the outputconverter 335 directly, depending on the desired functionality. Further,in other exemplary embodiments, the circuit 380 can provide power toeach at the same time. Additionally, while it is shown that the circuit380 is positioned within the module 300′ in FIG. 3D, it can also bepositioned within the module 300″. Further, in some additionalembodiments such a conditioning circuit 380 can be made as part of thegenerator so that the power from the generator circuit can be readilyused as needed within the system 300.

FIG. 4 depicts another exemplary embodiment of the present invention. Inthis figure, a system 400 is shown having an engine drive power supply410, a wire feeder 420 and a welding/cutting power supply 430. The powersupply can be a hybrid engine drive power supply as shown in FIG. 2, orconstructed similar to known engine drive power supply devices. In fact,the power supply 410 can be constructed similar to that discussed inFIGS. 3A to 3C. As shown in this embodiment, the power supply 410 has anengine 411 which is coupled to a generator 412 to provide an outputpower to an output circuit 413. The output circuit 413 generates asynchronous power signal, which can be any of 120, 230, 380 and/or 460VAC at 50/60 Hz. In other exemplary embodiments, other synchronous VACsignals can be provided. This output is provided to the outlet circuit417 which has at least one outlet 418. This synchronized output powersignal is neither a welding or cutting signal, but is a synchronizedpower signal that can be used by various loads (power supplies, devices)that are typically coupled to utility grid power outlets or othersynchronized load sources. Each of the loads 420 and 430 are capable ofusing the synchronous output signals to power their operation. Thecontroller 414 is used to control the operation of the power supply 410and is coupled to the user interface 415, which can be used by the userto control the operation of the power supply 410, and the othercomponents as shown. Further, the power supply 410 has a communicationdevice 416 which is capable of transmitting and receiving data from anyof the loads 420/430 (each of which has its own communication device—421and 431, respectively). Further, the communication device 416 can allowfor communication with remote control/pendant devices and the like toallow for remote monitoring and control of the system 400 and the powersupply 410. It should be noted that each of the exemplary loads, likethe power supply 430 and the wire feeder 420, can be constructed likeknown systems, which include controllers, power conversion circuitry,etc. that are known to be used by such systems to accomplish theirintended function. In each case, the controllers (not shown) of thefeeder 420 and power supplies 430 are coupled to the respectivecommunication circuits 421/431 so that status (and other information) ofthe devices 420/430 can be communicated to the controller 414. This isdiscussed further below.

In exemplary embodiments of the present invention, the power supply 410communicates with each of the loads 420 and 430 (in the example shown awire feeder and welding power supply) and each of the loads provide apredicted or anticipated load/power demand to the power supply 410 sothat the power supply 410 can prepare for the load demand. This isexplained further below.

In known engine/generator systems a synchronous power signal can begenerated. However, with these systems the engine/generator system doesnot optimize the output of the synchronized power signal (e.g., 230 VAC)for dynamic conditions. For example, the welding output for a connectedwelding device may be set a high load/demand setting, but theengine/generator system providing the power may only be set at a lowidle setting. This can create power/demand issues when there are highpower demand operations, such as when a welding arc is struck.

Embodiments of the present invention address this, and other issues, byhaving the connected devices 420 and 430 communicate with the powersupply 410 so that the power supply 410 is provided with an anticipatedload demand and be ready to provide the desired power level when needed.

For example, as shown in FIG. 4, a wire feeder 420 and a welding powersupply 430 are coupled to the synchronous outlet circuit 417 of thepower supply/generator 410. The welding power supply 430 can be anyknown type of welding or cutting power supply that is designed to becoupled to a synchronous power outlet, such as those provided by autility grid. However, the welding/cutting power supply 430 has acontroller (not shown) and a communication device 431 which allows thepower supply 430 to communicate with the engine drive power supply 410via its own communication device 416 and controller 414. Thiscommunication can be via any known wireless or wired connection. Withthis communication link, embodiments of the present invention allow forthe loads 420 and 430 to communicate with the power supply/generator 410so that the generator can be prepared for the demand.

For example, if the load 430 is a welder or a plasma cutter, it may beset for an operational level which requires a high power demand at arcignition. If the power supply/generator 410 is set at a low idle speed,this setting may not be sufficient to provide for smooth transition tothe high energy demand of the load 430, during strike or arc ignition.Embodiments of the present invention address this issue by allowing forpredictive communication between the load 430 and the powersupply/generator 410 to ensure a proper operation of the loads. Adiscussion of an exemplary operation of the system 400 is set forthbelow.

In the system 400, when a load like a welding/cutting power supply 430is coupled to the generator 410 a communication link is made between thecomponents such that the power supply/generator 410 recognizes that theload 430 is coupled to it. This communication link can be made over thecable connection 450/451 between the components. The welding/cuttingpower supply 430 then communicates its power settings and/or changes inits power settings to the controller 414 of the power supply/generator410, so that the controller can adjust the output of the power supplyand/or the engine RPMs appropriately. For example, if the welding powersupply 430 is set to weld at a current level of 200 amps or higher thisinformation is communicated to the controller 414. Using thisinformation, the controller 414 determines whether or not the engineRPMs are at the proper speed to ensure that the power demands of thewelder for its operation/start are sufficiently met. If the RPMs of theengine are not at a proper RPM level, the controller 414 causes theengine speed to increase to the desired setting. Similarly, in otherexemplary embodiments, if the engine RPMs are high relative to the powerdemand based on the settings of the load 430, then the controller 414can slow the engine 411 so that fuel is not wasted.

Thus, in exemplary embodiments, the power supply 410 and the load 430communicate with each other and the controller 414 of the powersupply/generator 410 uses these communications to control the engine 411and the operation of the power supply 410. That is, the controller 414can use settings and/or operational set points of the load 430 tocontrol its operation. In exemplary embodiments, if the controllerdetermines that the RPM settings is too low it will cause the RPMs toincrease, if the controller 414 determines that that the current RPMsetting is acceptable then no change will be made, and if the controller414 determines that the RPMs are too high, creating unneeded energy thenthe controller causes the engine to slow down. This ensures that anoptimal engine RPM settings is maintained as needed and that any weldingor cutting operation made via the load 430 is performed without anydifficulty.

In further exemplary embodiments, the controller 414 can use predictiveinformation from the power supply 430 to vary its output and/or engineoperation during a welding operation. For example, the welding powersupply 430 can communicate to the power supply 410 that a weldingoperation is about to start, and communicates information about thewelding operation that is used by the controller 414 to control theoperation of the power supply—including the welding operation type(pulse, stick, CC, CV, etc.), the average current for the weldingoperation etc. With this information the controller 414 causes theengine/generator and output circuit to prepare to deliver the powerneeded to start a welding operation. In many instances, because of thehigh current demand for an arc start, the output power needed at thestart of a welding operation can be higher than that needed for the mainportion of the welding operation. Thus, in such exemplary embodiments,the controller 414 causes the power supply 410 to prepare for an arcstart—and the associated power demand (e.g., increase engine speed,etc.) and then once the arc start is confirmed by the welding powersupply 430 to the power supply 410, the controller 414 can cause theengine 411, and other components, to settle into a mode of operationneeded for the welding operation. For example, the controller 414 candetermine—prior to a welding operation beginning—that for a givenwelding operation the engine 411 will need to provide 1,500 RPMs for thearc start aspect of the weld process, but after the arc starts theengine will only need to provide 1,200 RPMs for the remainder of theweld process. Thus, once the arc start is communicated, the controller414 causes the engine 411 to slow down as needed. This has the advantageof optimizing the use of the engine 411, and the power supply 410.

In further exemplary embodiments of the present invention, thecontroller 414 does not cause a change in engine RPM until the demand isactually needed. For example, in any given welding/cutting operationthere may be an appreciable delay between inputting the operationalsettings on the welder/cutter 430 and actually performing the operation.Thus, it is unnecessary to have the RPMs of the engine 411 increased ifthe actual demand for the increased RPMs will not be needed for a periodof time. Therefore, in some exemplary embodiments of the presentinvention a user can generate an input signal either on the welder 430and/or on a torch/gun 460 coupled to the welder 430. For example, a usercan input a current setting at the welder 430 of 300 amps for a givenwelding operation. This setting can be communicated to the power supply410 and/or the controller 414 can query the controller of the welder 430to obtain its operational settings. Based on this information, thecontroller 414 determines the appropriate RPM setting for the engine toensure the appropriate power is available to the load 430. However, thecontroller 414 does not initiate the RPM change (if needed) until a userinput is received that the welding/cutting process is about to begin.For example, the user can interact with a user input panel/device on theload/welder 430 or on a torch 460. This interaction can send a signal tothe controller 414 indicating that the load demand will be imminent andso the controller 414 causes the engine RPM speed to change to thedesired level. For example, the torch/gun 460 can have a switch 461which is activated by the user to indicate that he/she is ready to beginthe operation. This data input can be used by the controller 414 toincrease the RPMs. For example, the system can be configured such thatthe controller 414 will not make any changes to the output power of thepower supply 410 and/or any change in engine speed until after apredetermined period of time after a user input. In some exemplaryembodiments, this time can be in the range of 1 to 10 seconds. As anexample, (1) a user enters information about a welding operation to thewelding power supply 430; (2) this information is communicated to thecontroller 414, along with any load information for any otherdevice—such as a wire feeder 420; (3) the controller 414 uses thisinformation to determine an appropriate output power and/or frequencyfor a welding operation, along with an appropriate RPM speed for theengine 411; (4) the controller waits to detect a user input indicatingthat the process is about to begin—for example, from a switch 461 on thegun 460, power supply 430, or any other means; (5) after an amount oftime—e.g., between 1 and 10 seconds—the controller 414 causes the enginespeed to change (if needed) so that the appropriate power can beprovided by the power supply 410; and (6) the welding process can begin.Similarly, exemplary embodiments can use similar user input to slowdown/shut off the power supply 410 when the power output is not needed.For example, the power supply 430 can communicate to the controller 4141that the load is no longer needed and/or a user input can indicate thatthe higher power output is not needed. As an example, when a user isdone welding the user can use the same switch 461 on the gun 460 or onthe power supply 430 to indicate that the process is completed and thecontroller 414 uses this indication to slow down the engine 411 to anidle speed to wait for the next operation. This can greatly increase theoperational efficiency of the power supply 410.

In further exemplary embodiments of the present invention the controller414 can operate the system 410, including the engine 411, to provide asynchronous output power which exceeds the determined anticipated poweror load demand. This is done to account for situations in which theremay be unexpected peaks or spikes in the power demand or otherunexpected increases in the demand for the synchronous power—which couldalso include the turning on, or plugging in, of another device in theoutlet circuit 417. For example, if it is determined by the controller414 that the synchronous output of the system 410 needs to be 5 kW basedon information from the devices 420/430, the controller 414 controls theengine 411 such that an output power of 5.25 kW is provided—a 5%increase. This can aid in smoothly dealing with unexpected powerdemands/spikes. In some embodiments, the controller 414 can control theengine such that at least a 3% power increase is provided over the totalanticipated load, while in other embodiments at least a 5% increase isprovided. In even further embodiments, at least a 10% power increase canbe provided. Further, in some embodiments, the % increase over thedetermined power need can be based on the type of load, or otherinformation, from the devices 420/430. For example, if a welding/cuttingprocess is to be used that has a relatively low chance of requiringpower spikes, the controller 414 can controller the engine 411 such thatonly a 3% power increase is provided above the anticipated load, but ifthe process has an increased chance of requiring power demand spikes,the controller 414 can set the engine speed 411 such that at least a 10%increase in the available synchronous power is provided. Thus, in suchembodiments, the controllers of the systems—such as the power supply430—communicates a type of process to be performed, or any type ofprocedure or process identifier—which is used by the controller 414 todetermine an available power increase factor. That is, for example, forsome processes/procedures the controller 414 will use a 3% powerincrease factor, for others it will be a 5% increase factor, and yet forothers it will be a 10% increase factor. In further embodiments, thisincrease factor can be set by a user via the user interface 415.

In a further exemplary embodiment, the switch 461 can also be thetrigger that is commonly used on known torches/guns. For example, theuser can initiate a quick double-toggle of the trigger 461 and thisdouble-toggle signals to the controller 414 that the process is about tobegin, at which time the controller 414 initiates the needed RPM change.After the double-toggle the user would wait for a period of time beforestarting to give the engine 411 time to reach the desired RPMs. Forexample, the user can wait 1 to 10 seconds and then begin the desiredoperation. Again, a second double toggle can be used to indicate thatthe process has been completed and that the engine can slow down.

In another exemplary embodiment, the torch/gun 460 can have an indicator462 which will provide a visual indication to the user that the engine411 is at the appropriate RPMs for the desired operation, and uponseeing the indication the user can begin the desired operation. Forexample the indicator 462 can be an LED, or similar type device, whichcan glow green, or any other desired color, to indicate to the user thatthe generator 410 is at the appropriate power level for the givenoperation. The indicator 462 can also be used to provide otherindications, including: (1) an indication that the power supply 410 isnot ready (e.g., red); and/or an indication that the welding/cuttingprocess is reaching/exceeding the output capacity of the power supply410 (e.g. a flashing red indicator). Of course, other indications canalso be provided.

With these exemplary embodiments, a welding/cutting power supply 430 canbe coupled to a generator 410 which provides a synchronous output signalvia outlets 418 and the system 400 ensures that the needed output poweris available at the outlets 418 when needed to ensure proper cuttingand/or welding operations. Of course, it should be noted that otherexemplary embodiments not be limited to using welding or cutting powersupplies, but other devices which require a synchronous power signal canbe coupled to the generator/power supply 410 and operate similar to thediscussions set forth above.

As shown in FIG. 4, multiple devices 420/430 can be coupled to thegenerator/power supply 410, where each of these devices can communicatewith the controller 414 as described above, so that the controller 414can determine/anticipate the appropriate RPM setting needed to providethe desired power at the outlets for each coupled device 420/430. Thus,embodiments of the present invention can determine the combined demandfrom multiple devices 420/430 and control the operation of theengine/generator in anticipation of that demand so that the neededpower/energy is available when needed. That is, the controller 414 canreceive anticipated power or load signals from each of the connecteddevices/loads 420/430 and utilize (e.g., sum) this information todetermine a total load needed for operation of the engine 411. However,in other exemplary embodiments, the respective controllers (not shown)of the systems 420/430 can simply send operational and/or load data andthe controller 414 uses this data to determine the total load demandneeded by the system 410. In such embodiments, rather than the devices420/430 sending an anticipated power load data, the controllers sendother operational data which is used by the controller 414 to determinethe load demand, which is then used to determine the appropriate RPMspeed for the engine 411. Further, in other exemplary embodiments, somedevices, such as the wire feeder 420 can have identification ability,such that the controller 414 recognizes the attached device (i.e., wirefeeder 420) and based on that recognition determines a load requirementfor that device based on stored memory regarding that device. Suchrecognition ability is known and need not be described in detail herein.

It is also noted that further exemplary embodiments need not be limitedto welding/cutting applications, and exemplary embodiments similar tothat shown in FIG. 4 can be utilized in numerous different applications.For example, turning to FIG. 4, the welding/cutting power supply 430 andthe wire feeder 420 can be replaced with any devices/systems whichrequire electrical power and can be coupled to a engine-drive powergeneration device. For example, the devices 420/430 can be devices suchas air compressors, a construction trailer, air conditioner, etc. Any ofthese electrical systems (i.e., electrical loads) can have a controllerand communication device/system (such as the ones discussed above) suchthat they can communicate with the power supply 410 and provide ananticipated load signals so that the controller 414 can prepare thesystem 410 to provide the appropriate synchronous power—as describedabove. For example, any one of the systems can be an air conditionerwith the capabilities discussed above to determine/send an anticipatedload signal to the controller 414. In exemplary embodiments, the airconditioner 420/430 can send a load ramp signal or an anticipated loadsignal to the controller 414 before the air conditioner (or any othertype of electrical load) starts is load cycle. Thus, as discussed above,the controller 414 can cause the engine 411 to be brought up to theappropriate RPMs to generate the appropriate power prior to the actualdemand for the load.

Further, in additional exemplary embodiments, the controller 414 canspeed up the engine 411 (consistent with the discussions above) prior toengaging a clutch between the engine 411 and the generator 412, suchthat the engine reaches the desired RPMs before the clutch is engaged.Because the use of clutches to couple generators and engines is wellknown, their use and structure need not be described herein.

FIG. 5 is a further exemplary embodiment of the present invention, wherea system 500 comprises at least two hybrid-engine drive powersupplies/generators (e.g., welders) which are coupled to each other asshown. Each of the generators 510/520 can be constructed similar toknown hybrid-engine power supplies, with the differences discussedherein. For example, the generators 510/520 can be constructed similarto the system discussed in FIG. 2 or FIGS. 3A to 3C herein.

As discussed above, the use of engine drive system with energy storagedevices is generally known. In these systems, the engine and generatorare used to recharge an energy storage device (e.g., battery) used inthe system to provide power to the welding/cutting operation. However,in most systems the engine-generator combination is capable ofoutputting more power than the charging rate of the energy storagedevice. Thus, in situations where there are multiple hybrid engine drivewelders/generator present the additional engine capacity is not beingused efficiently. Exemplary embodiments of the present invention addressthis by efficiently using excess energy.

As shown, each of the generators 510/520 can be similarly constructed,in that they each can contain an engine 511/521, generator 512/522,output power circuit 513/523, an energy storage device 514/524, acontroller 515/525, a user interface 516/526, and a communication device517/527. The generators 510/520 can be used to generate welding and/orcutting power and provide that output power to a load, such as a weldingor cutting operation.

As shown in FIG. 5, in the depicted system 500 the controllers 515 and525 are in communication with each other via a connection 531. While theconnection is shown as a wired connection, this can also be via awireless connection via the communication devices 517/527. Because ofthis coupling the power generators 510/520 can communicate with eachother to implement embodiments of the invention as discussed herein.Further, as shown, the respective storage devices 514/524 are coupled toeach other. Because of this coupling, a single engine 511 or 521 can beused to charge both storage devices 514/524.

As stated above, a typical engine/generator combination can generatepower that exceeds the recharge rate of a storage device. Thus, inexemplary embodiments of the present invention, when multiple storagedevices 514/524 are in need of charging, a single engine/generator canbe used to charge both devices 514/524. In such embodiments, at leastone controller 517/527 (which can be in a slave-master relationship) candetermine that the storage devices 514/524 are in need of charging, andthat the output power of a single generator 512 is sufficient to chargeboth storage devices 514/524. When this determination is made by thecontroller 515 and is communicated to controller 524, the controller 524causes the engine 521 to be shut off, or at least reduced to an idle, orlow idle speed so that the charging of both devices 514/524 is performedby only one engine/generator combination (e.g., items 511 and 512). Thissaves fuel in the second power generator 520, as the engine 521 need notrun to charge the battery 524 in that system. This configuration is muchmore efficient than known systems.

In further exemplary embodiments, a single engine/generator combinationcan be used even when there are loads on each of the respective systems510/520. For example, in certain situations a single engine/generatorcombination (e.g., 511/512) can generate enough average power to for theloads on each of the power supplies 510 and 520, such that, again, onlya single engine need run to perform two welding operations. Thus, inexemplary embodiments, the output from a single engine/generatorcombination can be used to provide the output power for more than oneengine-drive power generators (e.g., welders). In such embodiments, atleast one of the controllers evaluates the load demand for each of thewelders 510/520 and determines if a single engine/generator combinationcan supply the average power output to satisfy both loads. In furtherexemplary embodiments, at least one of the controller(s) compares forthe power needed for both loads with the average power available from asingle engine/generator combination and each of the respective storagedevices 514/524 to determine if enough average power is available tosustain both loads as required with only a single engine running. If thecombined loads have a power requirement before the available averagepower, then a single engine/generator combination is operated to providethe power to the loads (which can be welding or cutting operations, or acombination thereof). If the controller(s) determines that the loadsrequire a higher average power than that available from a singleengine/generator combination can provide, then the controller(s) cancause the other of the engine/generator combinations to provide theadditional power needed. In such exemplary embodiments, thecontroller(s) can control the RPMs of the engines to ensure that thesystem 500 runs as efficiently as possible. That is, in some powerdemand applications it will be not necessary to run each system 510/520at its full capacity, and thus waste fuel. For example, a controller(s)may determine that one engine 511 will need to run at full power whilethe other 521 only needs to operate at a lesser idle speed to providethe needed power. This, again, optimizes fuel efficiency whiledelivering the appropriate amount of power needed for both loads.

Thus, with the above described configuration, embodiments of the presentinvention can communicate respective storage device charge levels,available power output, and/or load information and demand between thecontrollers 515/525 so that the controllers can control the operation ofthe systems 510/520 in an optimal way.

In some exemplary embodiments, a control methodology can be used toensure that an appropriate amount of power is available for a givenoperation. For example, if the system 520 is the only system being usedfor a given welding/cutting operation, but its load demand is near thecapacity of the system 520, the other system 510 can be running, at adesired level, to provide any excess power as may be needed during agiven operation. That is, if a given operation/load is close to themaximum output capacity of a single system 510/520, the other system canbe running to provide any needed additional power, if a spike in powerdemand is needed. For example, if the power supply 510 is being used inan operation which requires between 90 and 100% of the maximum outputpower of the supply 510, the controllers 515/525 cause the power supply520 to be running, at least in an idle state, to be ready for anyconditions/events, that may cause the power demand by the load to spikeover 100% of the maximum output power of the system 510. This can occur,for example, during short circuit events, restrikes, or any other eventsrequiring a high power output for a limited duration. Thus, exemplaryembodiments of the present invention allow the system 500 have thedesired available power for needed events, while optimizing fuel andsystem efficiency. Of course, it should be noted that the outputfrequency of the systems 510/520 should be synchronized when providingoutput to a single load. In the embodiment discussed above, the secondsystem 510/520 runs when the output of the operating system 510/520 isin the range of 90 to 100% of its maximum power output. However, inother exemplary embodiments, this range can be expanded, for example inthe range of 85 to 100% of its rated maximum output power. Further, inexemplary embodiments of the present invention, the maximum rated outputpower may not be the absolute maximum output power for a system 510/520,but can be a set or predetermined maximum output power rating based onthe construction and operation of the system and can be a power level atwhich normal operation of the system 510/520 can be sustained at anacceptable duty cycle. Of course, the maximum power output rating can bedefined in other ways, without departing from the spirit or scope of thepresent invention.

In further exemplary embodiments, the controllers 515/525 cancommunicate relative fuel levels of each respective system 510/520. Withthis information, the controller(s) can determine which of the system510/520 will be used to recharge both batteries and/or provide the loadsfor each of the system 510/520. For example, in an exemplary embodiment,the controller 515 can be the primary controller such that the system510 is the default primary system to provide power when the engine 521of the other system 520 is not running. The controller 515 monitors thefuel level in the system 510, such that when the fuel level drops belowa threshold level the controller 515 will communicate with thecontroller 525 to cause the engine 521 to start up, assuming that thesystem 520 has a sufficient fuel level. This will allow for anuninterrupted supply of power to the respective loads and/or charging ofthe storage devices 514/524 without the need for user intervention torefill a gas tank.

The fuel threshold level can be preprogrammed and/or can be set by auser. In exemplary embodiments, the fuel threshold level is set above azero fuel level to ensure that an engine does not run out of fuel. Thus,the controller(s) can determine which engine to run based on respectivefuel levels in the respective systems 510/520. It is noted that the fueltanks are not shown for reasons of simplicity, but the use andinstallation of fuel tanks in engine driven welder/generator are wellknown. In further exemplary embodiments, the controllers 515/525 canalso share/communicate fuel efficiency information between the systems510/520. This allows the controller(s) to determine which engine 511/521to run based on the relative fuel efficiency of the systems 510/520. Forexample, the system 510 can have a better fuel efficiency at a givenload demand, where the load demand is shared between the two systems510/520. Based on this information, the controller 515 determines thatthe engine 511 and generator 512 will be operated to provide the power,while the engine 521 will not be operated. Then if the total load demandchanges to a different level (either higher or lower) at which thesystem 520 is more fuel efficient, the controller 515 (and/or 525) cancause the engine 521 and generator 522 to turn on and provide the power,while shutting off the engine 511. This allows the system 500 tooptimize fuel efficiency across a wide range of load demand situations,not currently obtainable by current systems. This also allows a system500 to be used where each of the individual systems 510/520 havedifferent fuel efficiencies at different power output ranges.

In further exemplary embodiments, the controllers 515/525 can also shareerror and status information of the systems 510/520. For example, thecontrollers 515/525 can share error or status information for theirrespective engines and generators, such that when an error is detectedin one system 510 or 520, the controller(s) cause the power to besupplied by the other, non-fault, engine and generator combination. Thisensures that the power to the respective loads can be provided, eventhough an error may exist in one of the systems 510/520. Thus,embodiments of the present invention can allow two separate weldingoperations to continue even though one of the engines and/or generatorshas failed. Further, this system allows for multiple energy storagedevices 514/524 to be charged even though one engine/generatorcombination has failed or has performance issues.

In further exemplary embodiments, each of the systems 510/520 can be setup to run different processes at the same time. For example, the system510 can be set up to run a STT type welding process, while the system520 can be set up to run a pulse welding process (or any other differentprocess), and if it is determined (by one or both of the controllers)that only one engine/generator is needed to provide the needed power,then one engine is run, and two different welding processes can beprovided at the same time.

In view of the above, systems such as those shown in FIG. 5 greatlyimprove the flexibility and fuel efficiency of a welding system, usingat least two engine drive power supplies. Of course, embodiments are notlimited to just two engine drive systems, but any number can be linkedtogether and operated as described above.

It should be noted that while the above embodiments related to FIG. 5have been described as hybrid power supplies—having a storage device tosupplement power output—other exemplary embodiments can be moreconventional engine drive systems, and need not be hybrid systems. Thatis, in other exemplary embodiments, each of the systems 510/520 areconventional engine drive systems, having much of the structuresdescribed above, absent the additional storage devices 514/524. However,in such systems they function and operate similar as to that describedabove, and to the extent that the multiple power supplies are coupled toprovide a single output power, their respective output signals aresynchronized so that a single clean signal is provided. Thus, in suchembodiments, if each system 510/520 were rated at a maximum power outputof 10 kW, they can combine for a single output of 20 kW.

With referring to FIG. 5, with those embodiments that do not utilizehybrid welders (i.e., having the storage devices described above), thesystems will have the generator 512 coupled to the output power circuit523, and the generator 522 coupled to the output power circuit 513. Withthis configuration, the systems 510/520 can share power as describedabove such that an output signal can be provided from each system510/520 when only one engine is running (as described above). Further,in additional exemplary embodiments, a further power conditioningcircuit can be positioned between the generators and the output powercircuits depicted in FIG. 5. These power conditioning circuits canconfigure the generator power to a power that can be used by therespective output power circuits without departing from the scope orspirit of the present invention. These circuits can condition thegenerator power such that it is smoothed, etc., and such circuits areknown. Further, these circuits can be considered part of the generatorcircuits of each respective system 510/520.

While the claimed subject matter of the present application has beendescribed with reference to certain embodiments, it will be understoodby those skilled in the art that various changes may be made andequivalents may be substituted without departing from the scope of theclaimed subject matter. In addition, many modifications may be made toadapt a particular situation or material to the teachings of the claimedsubject matter without departing from its scope. Therefore, it isintended that the claimed subject matter not be limited to theparticular embodiment disclosed, but that the claimed subject matterwill include all embodiments falling within the scope of the appendedclaims.

We claim:
 1. A welding or cutting power supply, comprising: a firstmodule comprising: an internal combustion engine; and a generatorcoupled to said internal combustion engine, where said generatorgenerates electrical power; and a second module which is physicallyconnectable to and detachable from said first module, said second modulecomprising: an energy storage device which receives said electricalpower when said second module is coupled to said first module and usessaid electrical power to charge said energy storage device, and wheresaid energy storage device generates an output power; a power conversioncircuit which is coupled to said energy storage device and whichgenerates a welding or cutting output signal to be output from saidsecond module; wherein when said second module is physically coupled tosaid first module said power conversion circuit uses at least one ofsaid output power and said electrical power to generate said welding orcutting output signal; wherein when said second module is physicallyremoved from said first module said power conversion circuit uses onlysaid output power from said energy storage device to generate saidwelding or cutting output signal; and wherein when said second module isphysically coupled to said first module said power conversion circuithas a first peak output power and when said second module is physicallyremoved from said first module said power conversion circuit has asecond peak output power which is less than said first peak outputpower.
 2. The welding or cutting power supply of claim 1, wherein saidfirst module further comprises a power conditioning and charging circuitcoupled to said generator to receive said electrical power from saidgenerator and output at least one of a charging signal and an outputpower signal, where said energy storage device receives said chargingsignal when said first and second modules are coupled to each other, andsaid power conversion circuit receives said output power signal whensaid first and second modules are coupled to each other.
 3. The weldingor cutting power supply of claim 1, wherein said first module has afirst user interface to control operation of at least said first moduleand wherein said second module has a second user interface whichcontrols the operation of said second module when said second module isremoved from said first module.
 4. The welding or cutting power supplyof claim 1, wherein each of said first and second modules have acommunication device such that said first and second modules cancommunicate with each other when said second module is separated fromsaid first module.
 5. The welding or cutting power supply of claim 1,wherein said first module has an auxiliary power circuit which receivesat least some of said electrical power and generates an auxiliary powersignal.
 6. The welding or cutting power supply of claim 1, wherein aratio of said first peak output power to said second peak output poweris at least 2 to
 1. 7. The welding or cutting power supply of claim 1,wherein a ratio of said first peak output power to said second peakoutput power is on the range of 2 to 1 to 5 to
 1. 8. The welding orcutting power supply of claim 1, wherein said second module has acontroller and a communication circuit which communicates with saidfirst module when said first and second modules are separated, andwherein said controller and communication circuit transmit an enginestart signal to said first module when said energy storage device fallsbelow a threshold energy storage level.
 9. The welding or cutting powersupply of claim 1, wherein said second module contains a controller anda location device and wherein when said location device determines thatsaid second module is remote from said first module by more than apredetermined distance said controller interrupts operation of saidsecond module.
 10. A welding or cutting power supply, comprising: afirst module comprising: an internal combustion engine; a generatorcoupled to said internal combustion engine, where said generatorgenerates electrical power; and a power conditioning and chargingcircuit coupled to said generator to receive said electrical power fromsaid generator and output at least one of a charging signal and anoutput power signal; and a second module which is physically connectableto and detachable from said first module, said second module comprising:an energy storage device which receives said electrical power when saidsecond module is coupled to said first module and uses said electricalpower to charge said energy storage device, and where said energystorage device generates an output power; a power conversion circuitwhich is coupled to said energy storage device and which generates awelding or cutting output signal to be output from said second module;and a first user interface which controls an operation of said secondmodule when said second module is removed from said first module;wherein when said second module is physically coupled to said firstmodule said power conversion circuit uses at least one of said outputpower and said electrical power to generate said welding or cuttingoutput signal; wherein when said second module is physically removedfrom said first module said power conversion circuit uses only saidoutput power from said energy storage device to generate said welding orcutting output signal; wherein when said second module is physicallycoupled to said first module said power conversion circuit has a firstpeak output power and when said second module is physically removed fromsaid first module said power conversion circuit has a second peak outputpower which is less than said first peak output power; and wherein saidenergy storage device receives said charging signal when said first andsecond modules are coupled to each other, and said power conversioncircuit receives said output power signal when said first and secondmodules are coupled to each other.
 11. The welding or cutting powersupply of claim 10, wherein said first module has a second userinterface to control operation of at least said first module.
 12. Thewelding or cutting power supply of claim 10, wherein each of said firstand second modules have a communication device such that said first andsecond modules can communicate with each other when said second moduleis separated from said first module.
 13. The welding or cutting powersupply of claim 10, wherein said first module has an auxiliary powercircuit which receives at least some of said electrical power andgenerates an auxiliary power signal.
 14. The welding or cutting powersupply of claim 10, wherein a ratio of said first peak output power tosaid second peak output power is at least 2 to
 1. 15. The welding orcutting power supply of claim 10, wherein a ratio of said first peakoutput power to said second peak output power is on the range of 2 to 1to 5 to
 1. 16. The welding or cutting power supply of claim 10, whereinsaid second module has a controller and a communication circuit whichcommunicates with said first module when said first and second modulesare separated, and wherein said controller and communication circuittransmit an engine start signal to said first module when said energystorage device falls below a threshold energy storage level.
 17. Thewelding or cutting power supply of claim 10, wherein said second modulecontains a controller and a location device and wherein when saidlocation device determines that said second module is remote from saidfirst module by more than a predetermined distance said controllerinterrupts operation of said second module.
 18. A welding or cuttingpower supply, comprising: a first module comprising: an internalcombustion engine; a generator coupled to said internal combustionengine, where said generator generates electrical power; and a powerconditioning and charging circuit coupled to said generator to receivesaid electrical power from said generator and output at least one of acharging signal and an output power signal; and a second module which isphysically connectable to and detachable from said first module, saidsecond module comprising: an energy storage device which receives saidelectrical power when said second module is coupled to said first moduleand uses said electrical power to charge said energy storage device, andwhere said energy storage device generates an output power; a powerconversion circuit which is coupled to said energy storage device andwhich generates a welding or cutting output signal to be output fromsaid second module; and a user interface which controls an operation ofsaid second module when said second module is removed from said firstmodule; wherein when said second module is physically coupled to saidfirst module said power conversion circuit uses at least one of saidoutput power and said electrical power to generate said welding orcutting output signal; wherein when said second module is physicallyremoved from said first module said power conversion circuit uses onlysaid output power from said energy storage device to generate saidwelding or cutting output signal; wherein when said second module isphysically coupled to said first module said power conversion circuithas a first peak output power and when said second module is physicallyremoved from said first module said power conversion circuit has asecond peak output power which is less than said first peak outputpower, and a ratio between said first and second peak power outputs isat least 2 to 1; and wherein said energy storage device receives saidcharging signal when said first and second modules are coupled to eachother, and said power conversion circuit receives said output powersignal when said first and second modules are coupled to each other.